functional (_Bind<_Functor(_Bound_args...)>::__call): Rename const version to __call_c and remove _Sfinae template parameter.

2010-01-16  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/functional (_Bind<_Functor(_Bound_args...)>::__call):
	Rename const version to __call_c and remove _Sfinae template
	parameter.
	(_Bind<_Functor(_Bound_args...)>::operator()): Adjust.

	* include/std/functional: Pass everywhere temporary tuple<_Args...>
	arguments by rvalue reference. 

	* testsuite/20_util/bind/cv_quals.cc: New.

	* testsuite/20_util/bind/ref2.cc: Add missing test variables.

From-SVN: r155978